The Wordvice AI writing assistant has recently updated its revision tools package with an AI Proofreader (https://wordvice.ai/proofreading), AI Paraphraser ((https://wordvice.ai/tools/paraphrasing), and AI Text Summarizer (https://wordvice.ai/tools/summarizing). Compare to other popular writing/revision tools like Quillbot, Grammarly, and ProWritingAid and see the difference in performance for yourself!
Turnitin - Turnitin is preferred by educational institutions around the world for preventing plagiarism. Instructors at all levels of education can request that students use the service to submit papers, and Turnitin checks those papers for plagiarism.
Grammarly - Clear, effective, mistake-free writing everywhere you type.
PlagiarismSearch - PlagiarismSearch is online service that detects plagiarized content.
LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.
Unicheck - The plagiarism checker Unplag scans across the internet, repositories, open sources content and databases. It delivers real-time results and has no cached data.
Gramlee.com - Online grammar check, proofreading and copy editing services.